Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d96f127a48ce02…

MALICIOUS

PDF

131.9 KB Created: 2021-07-09 11:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 60f98d2868fb72bd4cad8f65c3f9c8a4 SHA-1: 0ed6c3da93481b28f729ca90efe1ce4047ff7753 SHA-256: a5d96f127a48ce0274e873e78a2660e81159bf2a70e4585261567351a3d47a20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to WordPress sites utilizing form upload plugins, suggesting a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the embedded links and the PDF structure points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa00ad24ae---41909081926.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4d882c37cd98c6cf4e5f9b8556008a64/muponuxififesupodegokob.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/gowekubumutune.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/58444890321.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/32357998845.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/gugeriv.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efabaf21fc---japepusolemiponijet.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ee782992050739a905988c519bdf2ca4/lepezowavedenarigupapo.pdfIn PDF document text
    • http://www.celso.org/download/penorapibume.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6d8e1bee7---kinilefopal.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/xobezuvixaz.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/9b4a78139eeeac0f2bc18b54034479bf/vakutonok.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/4fmpemjj2j1p4s2vjchi6goohj/82675875587.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/37469816598.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/68895334398.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/wopapixarob.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/281514202185.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2edc77d1f0---91044106130.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c3badd9a7---jilowosifuniligowavimof.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-1/20210501125820689553.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/favevotizesisi.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/voranafibetimifutovu.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/00ffc519a92ef7daf1d29fff6275e21f/movojemaxogezuse.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/8f2ab99e814befce32a4833e58f1c64b/12278714598.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/saffrbt245c6ftv4vkeh8pf834/xuponiteforapiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=wwe+2k19+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2D8 18012 bytes
SHA-256: 4f6caa5e136b1059f20ee4f698296d79293d2cc624ed7af585c671973239c593
font_01_sfnt_off0001d233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D233 10548 bytes
SHA-256: c75fd6aeadba0cb8c6a9cb6ee09cae9621b935a6820af53b4f990db335690091
font_02_sfnt_off0001ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1